Glassware Technical Information

Jointed Glassware

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SciLabware can supply an extensive range of jointed glassware products utilising a conical, spherical or flat flange ground glass joint or screwthread joint in our Quickfit®, SVL® and Wheaton® product ranges.

Quickfit® interchangeable conical joints are made to an accuracy that surpasses the requirements of ISO 383 & DIN 12242. A two stage grinding process ensures that the joints have a precision 1:10 taper and super-fine surface finish, resulting in joints that have an exceptionally good seal with a greatly reduced risk of joint seizure. The excellent surface finish also ensures that the joint will not leak and will be gas and vacuum tight.

Unlike the joints available from other manufacturers, Quickfit® sockets feature a rounded rim profile. This round design gives extra strength to the joint and is less prone to chipping than a square rim profile.

Conical ground glass joints are the most common type of Quickfit® joint and comprise a ground cone and socket. Joint sizes are described with two numbers e.g. 24/29

  • 24 – Diameter of the wide end of the ground joint (in millimetres)
  • 29 – Length of the ground joint (in millimetres). Also known as the length of joint engagement.

We are able to supply a range of different conical joint sizes from 5/13 to 60/64.

Details on the types of Quickfit® joints we can supply are as follows:

glassware joint diagrams quickfit screw head joints

Most Quickfit® conical ground glass joints are manufactured to comply with the European ‘B’ length joint size requirements of ISO 383. Wheaton® jointed glassware products are produced to American ASTM E-676 standard taper ground joint sizes.


European ‘B’ Length Joint Sizes:

SizeActual diameter of wide end (mm)Actual diameter of narrow end (mm)Nominal length of joint engagement (mm)
7/167.55.916
10/19108.119
12/2112.510.421
14/2314.512.223
19/2618.816.226
24/292421.129
29/3229.22632
34/3534.53135
40/384036.238
45/40454140
50/425045.842
55/445550.644
60/466055.446

American Standard Taper Joint Sizes

Size designationActual diameter of wide end (mm)Actual diameter of narrow end (mm)Nominal length of joint engagement (mm)
7/257.5525
10/2010730
12/3012.59.530
14/3514.51135
19/3818.81538
24/40242040
29/4229.22542
34/4534.53045
40/50403550
45/50454050
50/50504550
55/50555050
60/50605550
71/60716560
103/601039760

Quickfit® Screwthread Joints

When using screwthreads it is important that the PTFE washer is fitted carefully and correctly. This is best achieved by opening out the washer to the correct diameter using a tapered former. This should be carried out with the silicone rubber ring and PTFE washer in position in the plastic cap as shown in Fig1. Withdraw the tapered former and remove the rubber ring and washer from the cap. Fit each component separately to the fitting which is to be held, as shown in Fig 2, and screw the cap on to the thread. It is advisable that the ends of all fittings should be slightly tapered or fired in a Bunsen flame to remove sharp edges and produce a slight taper.

Find more information on our ranges of jointed glassware.

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